My tests show that the lower the incubation temperature the more the darker pigments are laid down in the skin. Hence the brown pigment displayed in all albino leopard gecko lines is the result of temperature and not genetics, which explains how some breeders have all "pretty" albinos and some do not. These results now give the breeder a great advantage to get the best possible offspring from their projects.
In the near future, I will be posting photos of albinos that have changed color from light to dark after hatching due to exposure to temperatures below 84F even as adults. This is a phenomena unique to leopard geckos. Keeping your albinos with a 90F hot spot all the time will prevent this migration of pigment in their skin.
All other information regarding this subject is on my Temperature Color Dependence FAQ page.